Gear ratios?

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maceemiller
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Gear ratios?

#1

Post by maceemiller »


Hi all.

So I have a 3.3 RPM synchronous motor for my barn door tracker. Using gears, what would I need to get the RPM down to 1?

Thankyou

Carl
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Re: Gear ratios?

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Perhaps a 33 tooth gear on the motor, and a 10 tooth on the nut for the rod.... If I'm doing the math right :lol: I'm trying the same sort of thing as well :D

Good luck, be curious as to how all this works for you!

All the best,
Mark

"The Hankmeister" Celestron 8SE, orange tube Vixen made C80, CG4 & AZ-EQ5 mounts.
Too much Towa glass/mirrors.

H/A - PST stage 2 mod with a Baader 90mm ERF on a Celestron XLT 102 (thanks Mike!)
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W/L - C80-HD with Baader 5.0 & 3.8 Solar film, Solar Continuum 7.5nm and UV/IR filters with a Canon EOS 550D.

Oh yeah, and Solar Cycle 25 :D
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Re: Gear ratios?

#3

Post by maceemiller »


Mmmmm....

I think I've worked it out...

For example, my motor is 3.3RPM
If the cog on the motor has 24 teeth and the other cog has 80 teeth I divide 80 by 24 which gives 3.3.

Divide the motor rpm which is 3.3 by the cogs division which is also 3.3 that gives an answer of 1, the rpm I need for my tracker.

Am I right in this?
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Re: Gear ratios?

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Looks good to me, and I think I had it backwards for which gear goes where... it's 6AM here, first cup of coffee... Your math skills are significantly better than mine as well ;)

I'm still trying to find a motor that I can use with my so basic electronic skills, or lack thereof :lol:

Good luck!
Mark

"The Hankmeister" Celestron 8SE, orange tube Vixen made C80, CG4 & AZ-EQ5 mounts.
Too much Towa glass/mirrors.

H/A - PST stage 2 mod with a Baader 90mm ERF on a Celestron XLT 102 (thanks Mike!)
Ca-K - W/O 61mm, Antares 1.6 barlow, Baader 3.8 OD and Ca-K filters with a ZWO ASI174mm.
W/L - C80-HD with Baader 5.0 & 3.8 Solar film, Solar Continuum 7.5nm and UV/IR filters with a Canon EOS 550D.

Oh yeah, and Solar Cycle 25 :D
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Re: Gear ratios?

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Post by maceemiller »


Thefatkitty wrote: Thu Mar 05, 2020 11:25 am Looks good to me, and I think I had it backwards for which gear goes where... it's 6AM here, first cup of coffee... Your math skills are significantly better than mine as well ;)

I'm still trying to find a motor that I can use with my so basic electronic skills, or lack thereof :lol:

Good luck!
I did think the cogs were backwards! I'm no electronic whiz either. The motor I'm using I got from an old Christmas decoration.....it was a reindeer that lights up and nods its head slowly :)
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Re: Gear ratios?

#6

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maceemiller wrote: Thu Mar 05, 2020 11:37 am I did think the cogs were backwards! I'm no electronic whiz either. The motor I'm using I got from an old Christmas decoration.....it was a reindeer that lights up and nods its head slowly :)
Yeah, if I did the gears there'd be some impressive star trails :lol: That is absolutely brilliant where you got the motor from, it never would have dawned on me! We have this Scooby-Doo dressed as Santa; we got it when my daughter was five. It waves a paw or something like that, and we haven't had it out in a few years. Wonder what I'll be doing tonight? :lol:

Thanks again for the idea, Carl!

All the best,
Mark

"The Hankmeister" Celestron 8SE, orange tube Vixen made C80, CG4 & AZ-EQ5 mounts.
Too much Towa glass/mirrors.

H/A - PST stage 2 mod with a Baader 90mm ERF on a Celestron XLT 102 (thanks Mike!)
Ca-K - W/O 61mm, Antares 1.6 barlow, Baader 3.8 OD and Ca-K filters with a ZWO ASI174mm.
W/L - C80-HD with Baader 5.0 & 3.8 Solar film, Solar Continuum 7.5nm and UV/IR filters with a Canon EOS 550D.

Oh yeah, and Solar Cycle 25 :D
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Re: Gear ratios?

#7

Post by maceemiller »


Thefatkitty wrote: Thu Mar 05, 2020 12:16 pm
maceemiller wrote: Thu Mar 05, 2020 11:37 am I did think the cogs were backwards! I'm no electronic whiz either. The motor I'm using I got from an old Christmas decoration.....it was a reindeer that lights up and nods its head slowly :)
Yeah, if I did the gears there'd be some impressive star trails :lol: That is absolutely brilliant where you got the motor from, it never would have dawned on me! We have this Scooby-Doo dressed as Santa; we got it when my daughter was five. It waves a paw or something like that, and we haven't had it out in a few years. Wonder what I'll be doing tonight? :lol:

Thanks again for the idea, Carl!

All the best,
Let me know how you get on :)
Heres a picture of the motor I will be using.....
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Re: Gear ratios?

#8

Post by maceemiller »


20200304_212050.jpg
maceemiller wrote: Thu Mar 05, 2020 8:06 pm
Thefatkitty wrote: Thu Mar 05, 2020 12:16 pm
maceemiller wrote: Thu Mar 05, 2020 11:37 am I did think the cogs were backwards! I'm no electronic whiz either. The motor I'm using I got from an old Christmas decoration.....it was a reindeer that lights up and nods its head slowly :)
Yeah, if I did the gears there'd be some impressive star trails :lol: That is absolutely brilliant where you got the motor from, it never would have dawned on me! We have this Scooby-Doo dressed as Santa; we got it when my daughter was five. It waves a paw or something like that, and we haven't had it out in a few years. Wonder what I'll be doing tonight? :lol:

Thanks again for the idea, Carl!

All the best,
Let me know how you get on :)
Heres a picture of the motor I will be using.....
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